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J=<a href="%pathto:imop.vl_imup;">VL_IMUP</a>(I) doubles the resolution of the image I by using
bilinear interpolation.
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See also: <a href="%pathto:imop.vl_imdown;">VL_IMDOWN</a>(), <a href="%pathto:vl_help;">VL_HELP</a>().
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